Abstract: A substantially tubular structure with a plurality of mesh cells (3, 4) composed of struts, with two connecting struts (5, 5?), disposed at proximal mesh cells at the proximal end of the tubular structure (1) and extending in proximal direction, and being provided with a coupling member (11) disposed proximally of the tubular structure (1) with the connecting struts (5, 5?) being connected to said member, wherein the coupling member (11) being connected to a pusher/insertion wire, and wherein struts of the proximal mesh cells, the connecting struts (5, 5?), and the coupling member (11) as well as bracing struts (9) that may be arranged between the proximal mesh cells form a closed, annular structure (6), and the annular structure (6) comprising a ring marker (12) with a radiopaque material for identifying the spatial position of the annular structure (6).

Abstract: A compensating chuck for concentrically clamping workpieces. The chuck has a drive unit having two pairs of entrainment members, wherein the entrainment members are preferably slidingly mounted, are respectively movable in paired relationship, and are so coupled to a respective one of the main jaws that a relative movement of a respective pair causes a synchronous movement of adjacent main jaws and that both a relative movement relative to each other with respectively different movement components and also a synchronous movement of the adjacent entrainment members in the same direction respectively causes a relative movement of adjacent main jaws.

Abstract: A power chuck includes a housing in which there is arranged a drive unit having a traction guide means moveable in the direction of a clamping axis. There are arranged two pairs of mutually diametrically opposite base jaws. The base jaws are guided radially, in the housing substantially perpendicularly to the clamping axis, and the drive unit is adapted to convert the movement of the traction guide means into the movement of the base jaws. According to the invention, it is proposed that the drive unit for each base jaw has a slider which is in engagement with the base jaw and which is moveable with a movement component on a circular path about the clamping axis.

Abstract: A compensation chuck for centrically clamping workpieces includes a housing, two pairs of mutually diametrally opposite base jaws for receiving corresponding clamping jaws, and a drive unit which is moveable preferably by power clamping having two pairs of drivable entrainment members. Two adjacent entrainment members are respectively coupled together by a first rocker and two further adjacent entrainment members are coupled together by a second rocker. There is also provided a coupling ring which guides a first entrainment member and a diametrally opposite second entrainment member in the peripheral direction tangentially relative to the clamping axis, such that a motion play is provided between the entrainment members and the coupling ring in the radial direction.

Abstract: A compensation chuck for centrically clamping workpieces includes a housing, two pairs of mutually diametrally opposite base jaws for receiving corresponding clamping jaws, and a drive unit which is moveable preferably by power clamping having two pairs of drivable entrainment members. Two adjacent entrainment members are respectively coupled together by a first rocker and two further adjacent entrainment members are coupled together by a second rocker. There is also provided a coupling ring which guides a first entrainment member and a diametrally opposite second entrainment member in the peripheral direction tangentially relative to the clamping axis, such that a motion play is provided between the entrainment members and the coupling ring in the radial direction.

Abstract: A power chuck includes a housing in which there is arranged a drive unit having a traction guide means moveable in the direction of a clamping axis. There, and there are arranged two pairs of mutually diametrically opposite base jaws. The base jaws are guided radially, in the housing substantially perpendicularly to the clamping axis, and the drive unit is adapted to convert the movement of the traction guide means into the movement of the base jaws. According to the invention, it is proposed that the drive unit for each base jaw has a slider which is in engagement with the base jaw and which is moveable with a movement component on a circular path about the clamping axis.

Abstract: A compensating chuck for concentrically clamping workpieces. The chuck has a drive unit having two pairs of entrainment members, wherein the entrainment members are preferably slidingly mounted, are respectively movable in paired relationship, and are so coupled to a respective one of the main jaws that a relative movement of a respective pair causes a synchronous movement of adjacent main jaws and that both a relative movement relative to each other with respectively different movement components and also a synchronous movement of the adjacent entrainment members in the same direction respectively causes a relative movement of adjacent main jaws.

Abstract: A fixed construction (10) comprises rigid piles (12) and a monolithic concrete floor slab resting (14) on the piles. The floor slab comprises straight zones connecting in two directions, ie. lengthwise and broadwise, the shortest distance between the areas of the floor slab above the piles. The floor slab (14) is reinforced by a combination of: (a) fibres (22) distributed over the volume of the floor slab (14); and (b) steel bars (16, 16′) located in those straight zones. This construction reduces considerably the amount of reinforcement steel, increases the bearing capacity and enables to reduce the time for making such a construction.